Discuss engine block identification. on AllFordMustangs.com, the place for Mustang enthusiasts.
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The numbers you need are right here. The ones beside the starter are casting numbers but the ones in this picture are the ones that'll tell you what the block came from.
They can be hard to even see, they're usually lightly stamped and can be covered in paint, grease, or rust.
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The old Boss blocks had screw in freeze plugs with square centers in the middle of the plugs..... not the press in plugs....dead giveaway to the old Boss block. You need something like a socket extension (square part on the end) to fit into the square slots to take them out. All the rest of the blocks back then got the press in plugs..... and I don't mean brass. They never used brass until later on
Take a look at YLDPONYS 69 block pic. Notice the freeze plugs ?